The Collaborative International Dictionary of English v.0.48:

Inchoation \In`cho*a"tion\, n. [L. inchoatio, incohatio.]
   Act of beginning; commencement; inception.
   [1913 Webster]

         The setting on foot some of those arts, in those parts,
         would be looked on as the first inchoation of them.
                                                  --Sir M. Hale.
   [1913 Webster]

         It is now in actual progress, from the rudest
         inchoation to the most elaborate finishing. --I.
                                                  Taylor.
   [1913 Webster]